Fix unlikely but possible race in `WeakValueDictionary`
It may happen that value in `valueArray` could have been already
collected by the GC but #clearDeadSlots have not yet been called.
When this happened, `#at:ifAbsentPut:` returned tombstone rather
than updating the dictionary with value from block.
This commit fixes this by checking whether `valueArray` contain
the tombstone and if so, clearing up the dead slots and restarting
the operation. HTH.
"
COPYRIGHT (c) 2001 by eXept Software AG
All Rights Reserved
This software is furnished under a license and may be used
only in accordance with the terms of that license and with the
inclusion of the above copyright notice. This software may not
be provided or otherwise made available to, or used by, any
other person. No title to or ownership of the software is
hereby transferred.
"
"{ Package: 'stx:libbasic' }"
Error subclass:#VMInternalError
instanceVariableNames:''
classVariableNames:''
poolDictionaries:''
category:'Kernel-Exceptions-Errors'
!
!VMInternalError class methodsFor:'documentation'!
copyright
"
COPYRIGHT (c) 2001 by eXept Software AG
All Rights Reserved
This software is furnished under a license and may be used
only in accordance with the terms of that license and with the
inclusion of the above copyright notice. This software may not
be provided or otherwise made available to, or used by, any
other person. No title to or ownership of the software is
hereby transferred.
"
!
documentation
"
VMInternalError is raised, when VM hits some bad error,
such as corrupted class, corrupted method/selector array, etc.
The message text gives some more information on what happened.
(for example, if you set an objects class to a non-behavior, nil etc.).
It is not guaranteed, that the system is in a working condition once
such an error occurred.
Instance Variables:
parameter - the object that triggered the error.
"
! !
!VMInternalError class methodsFor:'initialization'!
initialize
NotifierString := 'VM internal error: '.
! !
!VMInternalError class methodsFor:'documentation'!
version
^ '$Header: /cvs/stx/stx/libbasic/VMInternalError.st,v 1.3 2011-09-29 11:19:50 cg Exp $'
! !
VMInternalError initialize!